alta.school

Issued by R3

About this certificate

This digital certificate with serial number 04:1a:9a:8a:fc:6f:ce:a9:1a:ef:a2:99:0e:97:16:4a:8c:b5 was issued on by Let's Encrypt.

This certificate has already expired and will cause a warning or error message in the browser it's still listed on this site to allow you to look back on previously issued certificates. If we have found any compliance issues with this certificate they will be shown below. I hope this certificate review is providing you the detailed information in a simple form you where looking for.


We have idenified some issues with this certificate:
  • DV certificate contains a subject common name, this is not recommended. If certificate policy 2.23.140.1.2.1 (CA/B BR domain validated) is included, only country and/or common name is allowed in SubjectDN. (BRs: 7.1.2.7.2)
  • Subscriber certificates use of Subject Key Identifier is NOT RECOMMENDED (BRs v2: 7.1.2.7.6)
  • Subscriber Certificate: commonName is NOT RECOMMENDED. (BRs: 7.1.2.7.1)

Certificate Subject

CN=alta.school

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 04:1a:9a:8a:fc:6f:ce:a9:1a:ef:a2:99:0e:97:16:4a:8c:b5
Serial Number (int): 357501908035328245994176278363386776554677
Serial Number lenght: 139 bits, 18 octets

SubjectKeyId: cf:f2:84:f5:a4:54:97:44:72:68:be:53:4f:c9:e8:33:40:35:48:47
AuthorityKeyId: 14:2e:b3:17:b7:58:56:cb:ae:50:09:40:e6:1f:af:9d:8b:14:c2:c6

Fingerprint (sha1): 8d:86:12:01:fd:92:a2:3d:b0:d3:1c:09:a2:64:b1:0c:66:51:ff:cf
Fingerprint (sha256): 89:1b:f6:70:92:95:2c:75:33:95:57:25:4e:63:02:d4:1a:6f:41:92:b6:94:a4:f2:cf:a5:ee:46:9f:d8:69:14

Issuing Certificate URL: http://r3.i.lencr.org/

Revocation information

OCSP Server: http://r3.o.lencr.org

Check the revocation status for certificate alta.school

1

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for alta.school

Public Key Algorithm

RSA

Key Size

2048

Signature Algorithm

SHA256 with RSA

Key Usage

Digital Signature
Key Encipherment

Extended Key Usages

Server Authentication
Client Authentication

Extensions

9 extensions
No unhandled critical extensions

CA Certificate

This is not a CA certificate

Subject Alternative Names

alta.school

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alta.school
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fi.caisias.com
www.ln-training.com
app.tradebase.io
ywca-peacegallery.or.kr

Certificate

The complete raw certificate details for alta.school in PEM and ASN.1 format.

Certificate (PEM)

-----BEGIN CERTIFICATE-----
MIIE4zCCA8ugAwIBAgISBBqaivxvzqka76KZDpcWSoy1MA0GCSqGSIb3DQEBCwUA
MDIxCzAJBgNVBAYTAlVTMRYwFAYDVQQKEw1MZXQncyBFbmNyeXB0MQswCQYDVQQD
EwJSMzAeFw0yNDAzMDcwODE3MjNaFw0yNDA2MDUwODE3MjJaMBYxFDASBgNVBAMT
C2FsdGEuc2Nob29sMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA08Lc
s0NSwhfowY/pRBZj5ZYy3+NVxuti+ulNLP0G3sk4VbvlZnblPVxXuJCc09DnaQyu
9xULpKZKmRv4VqBTClz9hzaybe2if5I5VRg6x+Y17SlX6PCVhgPFQXnTU6iRsw4N
0HwbJH6yyIGSHF14DClaYTBVFPG+2OjevNW4XUmp8GTeiuwbwv2hEPnRkoCIXbtD
MlZs6sApWgAHv24m/yJbWN8e7udMZbaEbE1NapaakKKkmlnb9N5GFQzqSecBnWAv
bJx5Zrx9Qff6cha9xMaeUNkAGvZDq+q8n83+KOZ9j8J4kNKWJyGXAnf+BfY3lXcc
oXZV3zxoPl2DXm3i5QIDAQABo4ICDTCCAgkwDgYDVR0PAQH/BAQDAgWgMB0GA1Ud
JQQWMBQGCCsGAQUFBwMBBggrBgEFBQcDAjAMBgNVHRMBAf8EAjAAMB0GA1UdDgQW
BBTP8oT1pFSXRHJovlNPyegzQDVIRzAfBgNVHSMEGDAWgBQULrMXt1hWy65QCUDm
H6+dixTCxjBVBggrBgEFBQcBAQRJMEcwIQYIKwYBBQUHMAGGFWh0dHA6Ly9yMy5v
LmxlbmNyLm9yZzAiBggrBgEFBQcwAoYWaHR0cDovL3IzLmkubGVuY3Iub3JnLzAW
BgNVHREEDzANggthbHRhLnNjaG9vbDATBgNVHSAEDDAKMAgGBmeBDAECATCCAQQG
CisGAQQB1nkCBAIEgfUEgfIA8AB3ADtTd3U+LbmAToswWwb+QDtn2E/D9Me9AA0t
cm/h+tQXAAABjhgz+9YAAAQDAEgwRgIhAOVk40tMRT1Q+kU0kYLqqPViZI/yzTCg
SaGAYpX/wBJdAiEAgjq4bdnQKDKkG0SUybRkuYrmTfhOziq2v7wGgTyCEPwAdQBI
sONr2qZHNA/lagL6nTDrHFIBy1bdLIHZu7+rOdiEcwAAAY4YM/vZAAAEAwBGMEQC
IFGVpNtta8Oa41qkGYGG7rP+eLQYI/4Fwb05TYQ656D6AiBVRPAcNKzfmSmFd+d4
+BDWDA+2JCzhsVlDJAh9ssMBJTANBgkqhkiG9w0BAQsFAAOCAQEAFx5YDVjf7EE/
vFHNYS0JsafB32RoBBZnpI7uF6RnSoD5ejnF11kCVJYEXNa/7iPxKeuUxQRbEXos
64C9WxZUAA+11cYfBmC3Jg7Nx7s1N0oby2QE6RrQbzzB15aCyXwx7tyuOf0QutTX
jv9uEmNrqvigoVlkDl2e4YXGCrnXIO4O3jMIC1ePE0HSZu27afl3W5u/tGLamiYz
fU9NJQbodWH2g8qV3wyE73Ld8JFa+IR+vhb1hOu9WW1GPApFRHHk1wKECW+66zoJ
an0SJ9fDI6DrflHZseyTiaeh4qX1UoTGRN9btukyZczASmFXi1nP9lHU05J7TfQo
LgtvnoQV8w==
-----END CERTIFICATE-----

Public Key (PEM)

-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA08Lcs0NSwhfowY/pRBZj
5ZYy3+NVxuti+ulNLP0G3sk4VbvlZnblPVxXuJCc09DnaQyu9xULpKZKmRv4VqBT
Clz9hzaybe2if5I5VRg6x+Y17SlX6PCVhgPFQXnTU6iRsw4N0HwbJH6yyIGSHF14
DClaYTBVFPG+2OjevNW4XUmp8GTeiuwbwv2hEPnRkoCIXbtDMlZs6sApWgAHv24m
/yJbWN8e7udMZbaEbE1NapaakKKkmlnb9N5GFQzqSecBnWAvbJx5Zrx9Qff6cha9
xMaeUNkAGvZDq+q8n83+KOZ9j8J4kNKWJyGXAnf+BfY3lXccoXZV3zxoPl2DXm3i
5QIDAQAB
-----END PUBLIC KEY-----

ASN.1 decoded

 [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . [c:2|t:0|true] OtherName 
 . . . . . . . . . . . . [c:0|t:2|false] INTEGER 2
 . . . . . . . . [c:0|t:2|false] INTEGER 357501908035328245994176278363386776554677
 . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.2.840.113549.1.1.11 (sha256WithRSAEncryption)
 . . . . . . . . . . . . [c:0|t:5|false] NULL 
 . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . [c:0|t:17|true] SET, SET OF 
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.4.6 (countryName)
 . . . . . . . . . . . . . . . . . . . . [c:0|t:19|false] PrintableString 'US'
 . . . . . . . . . . . . [c:0|t:17|true] SET, SET OF 
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.4.10 (organizationName)
 . . . . . . . . . . . . . . . . . . . . [c:0|t:19|false] PrintableString 'Let's Encrypt'
 . . . . . . . . . . . . [c:0|t:17|true] SET, SET OF 
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.4.3 (commonName)
 . . . . . . . . . . . . . . . . . . . . [c:0|t:19|false] PrintableString 'R3'
 . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2024-03-07 08:17:23 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2024-06-05 08:17:22 +0000 UTC
 . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . [c:0|t:17|true] SET, SET OF 
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.4.3 (commonName)
 . . . . . . . . . . . . . . . . . . . . [c:0|t:19|false] PrintableString 'alta.school'
 . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.2.840.113549.1.1.1 (rsaEncryption)
 . . . . . . . . . . . . . . . . [c:0|t:5|false] NULL 
 . . . . . . . . . . . . [c:0|t:3|false] BIT STRING (2160 bits)
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:2|false] INTEGER 26732372435771683801202582360656476017510162577394464413201177540981659335500710308273736112252652098982724834280621059798208749925592188847524290920031551907884393979451108940981581709083011213613330067658106158063589509023184463314380418535296493363806797921353479722013552029478233508583634098511721310762123771268706501175565948208238264618812167361585705828390858805781691267612907559419860633488205172470310442554467819311622264142844564960256125198808828113141951692070737909046379601928232885204831634629023596412903989486126133221441968902815111380805413158055457115924534492854493709109831172011602121450213
 . . . . . . . . . . . . . . . . . . . . [c:0|t:2|false] INTEGER 65537

 . . . . . . . . [c:2|t:3|true] ORAddress 
 . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.15 (keyUsage)
 . . . . . . . . . . . . . . . . . . . . [c:0|t:1|false] BOOLEAN true
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (4 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:3|false] BIT STRING (3 bits)
							05a0
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.37 (extKeyUsage)
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (22 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.5.5.7.3.1 (serverAuth)
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.5.5.7.3.2 (clientAuth)
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.19 (basicConstraints)
 . . . . . . . . . . . . . . . . . . . . [c:0|t:1|false] BOOLEAN true
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (2 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.14 (subjectKeyIdentifier)
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (22 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (20 bytes)
							cff284f5a45497447268be534fc9e83340354847
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.35 (authorityKeyIdentifier)
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (24 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:0|false] OtherName 142eb317b75856cbae500940e61faf9d8b14c2c6
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.5.5.7.1.1 (authorityInfoAccess)
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (73 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.5.5.7.48.1 (ocsp)
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:6|false] IA5String 'http://r3.o.lencr.org'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.5.5.7.48.2 (caIssuers)
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:6|false] IA5String 'http://r3.i.lencr.org/'
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.17 (subjectAltName)
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (15 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'alta.school'
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.32 (certificatePolicies)
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (12 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.23.140.1.2.1 (Domain Validation Certificates Policy)
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.4.1.11129.2.4.2
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (245 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (242 bytes)
							00f00077003b5377753e2db9804e8b305b06fe403b67d84fc3f4c7bd000d2d726fe1fad4170000018e1833fbd60000040300483046022100e564e34b4c453d50fa45349182eaa8f562648ff2cd30a049a1806295ffc0125d022100823ab86dd9d02832a41b4494c9b464b98ae64df84ece2ab6bfbc06813c8210fc00750048b0e36bdaa647340fe56a02fa9d30eb1c5201cb56dd2c81d9bbbfab39d884730000018e1833fbd9000004030046304402205195a4db6d6bc39ae35aa4198186eeb3fe78b41823fe05c1bd394d843ae7a0fa02205544f01c34acdf99298577e778f810d60c0fb6242ce1b1594324087db2c30125
 . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.2.840.113549.1.1.11 (sha256WithRSAEncryption)
 . . . . . . . . [c:0|t:5|false] NULL 
 . . . . [c:0|t:3|false] BIT STRING (2048 bits)
		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